I used to work with a guy that made a morter from 2 inch schedule 80 seamless steel pipe. He had alot of fun shooting projectiles he made out of 1 1/2" (possibly 1 1/4") pipe with blackpowder.
He said they went a long way and he got to where he was hitting his targets pretty accurately.
When it blew up it took off his left leg below the knee.
I think having one would be pretty cool, but I'd want to put alot of research into it before building one.
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